Improvement in spiral molding-machines



2 Sheetsf-Sheet 2.

B. FAl ABBOTT- SPIRAL MoLDING MACHINE.

5 wn i s se s NITED STATES BENJAMIN F. ABBOTT, OF ALBANY, NEW YORK.

IMPROVEMENT IN SPIRAL MOLDING-MACHINES.

Specification forming part of Letters Patent No. 183,243, dated October 17, 1876 application filed September 17, 1874.

To all whom yit may concern A Be it known that I, BENJAMIN F. ABBOTT, of the city and county of Albany, State of New York,'have invented a certain Improvement in Spiral Molding-Machines; and l do hereby declare that the following' is a description thereof, reference being had to the accompanying drawings, forming a part of this specification, in which- Figure 1, Sheet l, represents a view from above ofthe machine embodying the improvements in this invention. Fig. 2 is a side view of the same. Fig. 3, Sheet 2, is an elevation of the cutting-head and its several adjuncts. Fig. 4 is a sectional elevation of the same. Fig. 5 is a cross-sectional view, taken at line No. l in Fig. l.

My invention relates to that class of molding-machines, operating on wood, for producing spiral forms on its periphery, and consists in the several devices and combinations of parts which I will proceed to describe in reference to the drawings and the letters of reference marked thereon, the same letters indicating similar parts.

ln the drawings, A represents the baseplate of the machine, from which the several parts are supported. B B and C C are standards, secured to the base-plate A, and carrying the bearings a a a a, in which the shafts D D revolve. The said shafts carry the feedrollers E E', and are revolved with the shafts D D by the bevel-gear F F', which are driven by proper gears G G', attached to the vertical shafts b b, revolved by the gear c, attached to the horizontal shaft d, operated by the band-pulley c, as shown in Fig. l. c' is a loose pulley. (Shown by dotted lines in the same figure.) The standards B B and C C' consist each of a shaft cut with a screw-thread on their outer periphery, as shown in Figs. 2 and 5, and are secured to the base-plate A by the screw-threaded nuts ff, Figs. l, 2, and 4.

The standards B and B are made with a less height than the standards O C. Each pair B Band C C may be variously adjusted in their height, so as to increase or diminish the distance between the rollers E E', as maybe desired, or may be required by the diameter of the piece of wood W to be operated upon.

If the piece W is of larger diameter, the standards B B must be lowered, while the standards- U C must be elevated. This lowering of the standardsB B is effected by running up the nuts ffon the standards until the shafts D D are brought down to a proper distance, to increase one-half of the desired increased diameter between the rollers E E',

\vhile,to lengthen the height of standards C O', the nuts ff are to be run down, and the nutsff are to be tightened down to the baseplate A to elevate the said standards C O to a height sufcient to increase the other, half of the desired increased diameter between the' said rollers. A reverse operation with the said nut-s ff will elevate the roller E and de-l press the roller E', so as to render the rollers capable of operating upon a piece of smaller diameter.

By this manner of construction and model of attachment of the standard with the baseplate A, any desired distance between thev rollers may be effected and permanently secured.

When the standards B B are placed on the right side of the machine, and the long stand-4 ards G G' 011 the left side, andthe shafts D D" are revolved in the direction indicated by ar-lv rows No. l in Figs. l and 2, the piece W will be revolved and carried forward in a manner which will effect a left-hand spiral formof surface of periphery when the cutting tool is made to act on the side of the piece W to ward the short standards B B.

When the standards B Bl and C C are changed in their places to the reverse of that shown in Figs. l and 2, and band-pulley c is made to revolve in an opposite direction by' the crossing of the belt, soas to cause the rollers to revolve in a direction indicated by arrows No. 2 in Figs. l and 2, and the cuttingtools are set toop'erate on the left-hand sideof the piece W,"and opposite to that shown in the 'said figures, the spiral will be made oir the periphery of the piece with a right-'hand form.

The cutter-head H consists of the fixed or stationary piece H1, secured firmly to the baseplate A, the' adjustable cutter-holders H2, and cutters H3, Figs. 1, 2, 3, and 4. The iiXed orl stationary piece H1 may be made of any deguide M ired form, with a central opening, I, Fig. 3, hrough which the `piece W may pass when arried forward by the rollers E E', andvhas rranged with it the adjustable cutterholders 12, which consist of the base-piece h, provided' Vith the pivot h1, working in the piece H1, on vhich pivot the said cutter-holder may be urned in either' direction, as indicated by lotted lines in Fig. 3. Slot-holes h2 are also nade in the said base to receive the holdingscrews h3, as shown in Figs. 1,2, and 3, which screws work into the piece H. Gast solid with ahe said piece H1 is the bracket 7c, provided with a slot, il. H3 H3 are the cutters, made with any form of cutting-edges that `may vbe zapable of producing the desired configuration to be given, in a spiral direction, to the piece W. lt is intended that the cutters H3 H3 should be made with their cutting-edges formed from the side lying next to the bracket, so that in cutters to be used to cut left-hand spirals the edges will be formed from the sides, as represented in Fig. 3, while for cutting right-hand spirals the said edges should be formed from the opposite side, and each machine to be used for `cutting right and left hand spirals should be supplied with both right and left hand cutters.

By these forms ot construction and arrangement of parts the one cutter-head` is rendered capable of being used for operating upon pieces of dierent diameters, say, from threequarters of an inch to five inches, more or less, diameters according as the several parts may be adjusted to cut spirals of either right or left hand form of direction.

When the pieceV to be operated upon is oi' small diameter, and its spiral form is to be cut left-hand, the cutter-holder H2 is to be swung on its pivot h1 in the direction indicated by arrow 1 in Fig. 3, and the cutter is to be secured ou the side toward which the piece W revolves, as shown in the same gure. If a piece of larger diameter is to be operated with, the said cutter-holder is to be swung in the direction indicated by arrow No. 2 in Fig. 3, more or less, so that the adjustable cutterholders H2 Hzfand the cutter H3 H3 will be made to stand relatively as indicated by dotted lilies fr in Fig. 3. The placing of the righthand cutters, referred to heretofore, on the opposite side ot' the bracket, and reversey shiftin g of the cutter-holders, will produceva proper adjustment of the cutters to form right-hand spirals upon pieces ot' different diameters.

To preserve the. piece W central with the machine, and to guide it in its travel forward in a direct manner, the hollow centering-piece L is placed back of the rollers E E', and the. M forward of the said4 rollers, and preferably supportedby and connected to the cutter-head H. The hollow centering-piece L may be made adjustable by thimbles, while the guides M Mare made capable of adjustment Vto the base-plate in an by working in ways cut in the cutter-head, and provided with slots and set-screws n a, working through the said slots and into the cutterhead, as shown in Fig. 1, so as to be capable of being variously set to adapt the spread of the guides to the diameters of the pieces to bc operated upon.

To operate with this improved 'machine,.the piece W to be cut being first rounded in a rounding-machine preparatory for the same, is passed through the hollow centering-piece' L and pushed forward so as to enter between the rollers E E', when the said rollers will carry the same forward into the guides M M through the stationary piece H1 of the cutterheadvH, and, twisting the said piece at the same time against the cutters H3, will cause the said piece W to have cut on its periphery a spiral or series of spirals, according to the number of cutters employed and of the form to correspond with the form of the cutters.

By. these improvements, `in a machine of comparatively small size, pieces of great length,

and of varying diameters may be .cut with either right or left hand spirals.

Having described my invention, what I" claim, and desire to secure by Letters Patent,

1. The vertically-adjustable feed-rollers E E', secured to the shafts D,` D', and so placed that their axial lines will be at acute angles with each other, in combinati" u with the gears F F', by which the said rollers are revolved, substantially as and for the purpose set forth.

2. In combination with th'ehfeed-rollers E', carried by the shafts D D placed at acute angles, the bearing-standards B and C U', of unequal lengths, providedl.` with screw-l threads on their entire lengths,"aud secured adjustable manner by` the nuts f f', substantially as and for the purpose set forth. y

` 3. The cutterhead .H, composed of the stationary piece H1, cutter-holders H2, and cutters H3, in combination with the verticallyadjustable feed-rollers E E', havin gtheir axial lines crossing each other, substantially as and for the purpose set forth.

et. The cutter-holders Hz, composed of the base h, provided with the pivot h1, and the bracket 7c, provided with slot i, in combination with the stationary piece H1, substantially as and for the purpose set forth.

5. In combination with the vertically-adjustable feed-rollers E E', having their axial lines crossing each other, and the stationary of the cutter-head H, the hollow piece Hl L, and the adjustable guides centering-piece `M M, substantially as and for the purpose vset forth.

BENJAMIN F. ABBOTT. Witnesses:

ALEX. SELKIRK, GrrAs. J. Summen. 

